Review on Lisle 81450 Adapt A Cap by Bryce Marshall

This is by far one of the best tools I've ever spent money on. For filling differentials, transfer cases, and transmissions with gear oil, this method is superior to any other filling method. It holds a full liter and doesn't leak a single drop like other suction guns. Very good quality and it's made of very durable plastic that looks like it will last for years.